diff --git a/requirements.txt b/requirements.txt
index bcad211..a900183 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -85,7 +85,7 @@ toolz==0.9.0
 tornado==5.1
 tqdm==4.23.4
 traitlets==4.3.2
-ujson==1.35
+ujson==5.4.0
 urllib3==1.23
 wcwidth==0.1.7
 webencodings==0.5.1